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Finding the Fourth Proportional to 1,980.63, 2,969.94 and 663.93

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Solution

The fourth proportional to 1,980.63, 2,969.94 and 663.93 is: 995.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.63 : 2,969.94 = 663.93 : x
  2. Step 2: Convert to fraction form
    1,980.63/2,969.94 = 663.93/x
  3. Step 3: Cross multiply
    1,980.63x = 2,969.94 × 663.93
  4. Step 4: Simplify right side
    1,980.63x = 1,971,832.26
  5. Step 5: Solve for x
    x = 1,971,832.26/1,980.63
  6. Step 6: Final answer
    x = 995.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.